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Answer :
The magnification of the astronomical telescope is approximately -0.00508, and the length of the telescope is 990 mm. Hence, the option (e) is correct.
To find the magnification and the length of an astronomical telescope, we can use the formula for magnification:
Magnification = -Fe/Fo
Given:
Fo = 985 mm (focal length of the objective lens)
Fe = 5.0 mm (focal length of the eyepiece)
Plugging the values into the formula, we get:
Magnification = -(5.0 mm)/(985 mm)
Simplifying the expression:
Magnification ≈ -0.00508
So, the magnification is approximately -0.00508.
To find the length of the telescope, we can use the formula:
Length = Fo + Fe
Plugging in the values:
Length = 985 mm + 5.0 mm
Simplifying the expression:
Length = 990 mm
Therefore, the length of the telescope is 990 mm.
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